new york mayor michael bloomberg with his group mayors against illegal guns released an ad today. in this ad, it features the mother -- do you remember 9-year-old christina taylor green? the youngest person killed in that attack in tucson. >> my 9-year-old daughter was murdered in the tucson shooting. i have one question for our political leaders. when will you find the courage to stand up to the gun lobby? whose child has to die next? >> her mother, roxana green there, will be talking with me in the next hour. stay tuned for that. there is another perhaps surprising voice on green's side. stanley mcchrystal, the u.s. top commander in afghanistan who left back in 2010. well, just this morning on msnbc, he said the kinds of weapons his troops used should not, i repeat, should not be used on the streets of america. >> we got to look at the situation in america. the number of people in america killed by firearms is extraordinary compared to other nations. and i don't think we're a blood thirsty culture. and so i think that we need to look at everything we can do to safeguard our peop